The pro basketball community is in uproar after an audiotape of L.A. Clippers owner Donald Sterling allegedly making racist remarks surfaced over the weekend. Here are five things to know about the controversy:

1. What Sterling allegedly said in the leaked recordingThe controversy began when TMZ published the audio from a nine-minute phone call between L.A. Clippers owner Donald Sterling and his then-mistress V. Stiviano. Deadspin later acquired an extended 15-minute version of their conversation, in which Sterling told Stiviano she should not bring black people to Clippers games.

“I don’t understand, I don’t see your views,” Stiviana, who is African American, is heard saying. “I wasn’t raised the way you were raised.”

He also reportedly asked Stiviano to remove all photos of black people from her Instagram account. Later in the call, he complained about his belief that black Jews living in Israel are “less than the white Jews.”

2. Sterling faces widespread condemnationSterling’s racist diatribe drew sharp criticism from President Obama, who said during a recent news conference in Malaysia,

“When ignorant folks want to advertise their ignorance, you don’t really have to do anything, you just let them talk. That’s what happened here…I think that we just have to be clear and steady in denouncing it, teaching our children differently, but also remaining hopeful that part of why statements like this stand out some much is because there has been this shift in how we view ourselves.”

Several NBA legends, including Michael Jordan, who is now the majority owner of the Charlotte Bobcats, also criticized Sterling.

“As an owner, I’m obviously disgusted that a fellow team owner could hold such sickening and offensive views,” Jordan said. “As a former player, I’m completely outraged. There is no room in the NBA—or anywhere else—for the kind of racism and hatred that Mr. Sterling allegedly expressed.”

3. Sterling’s responseIn an interview with TMZ Sports, Sterling suggested the audio recording may have been manipulated, and shifted the blame to his former mistress, V. Stiviana, accusing her of embezzling more than $1.8 from him. In a statement, his representatives denied he holds racist views:

“Mr. Sterling is emphatic that what is reflected on that recording is not consistent with, nor does it reflect his views, beliefs or feelings. It is the antithesis of who he is, what he believes and how he has lived his life,” the statement reads. “He feels terrible that such sentiments are being attributed to him and apologizes to anyone who might have been hurt by them.”

4. Clippers team members stage silent protestThe Clippers staged a silent protest Sunday in light of Sterling’s alleged racist remarks. During practice for a playoff game, they wore their t-shirts inside out to hide the Clippers logo, and played the game with their regular uniforms.

5. The National Basketball Players Association is investigating Sterling’s remarksChris Paul, president of the National Basketball Players Association, issued the following statement over the weekend:

“On behalf of the National Basketball Players Association, this is a very serious issue which we will address aggressively. We have asked Mayor Kevin Johnson to expand his responsibilities with the NBPA, to determine our response and our next steps. As players, we owe it to our teams and our fans to keep our focus on our game, the playoffs, and a drive to the Finals.”

The NBPA has also reportedly demanded that Sterling be banned from all playoff games this season.